<template>
	<view class="u-wrap">
		<view class="u-search-box">
			<view class="u-search-inner" @click="search">
				<u-icon name="search" color="#909399" :size="28"></u-icon>
				<text class="u-search-text" @click="search">搜索</text>
			</view>
		</view>
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
				<view v-for="(item,index) in tabbar" :key="index" class="u-tab-item"
					:class="[current==index ? 'u-tab-item-active' : '']" :data-current="index"
					@tap.stop="swichMenu(index,item.id)">
					<text class="u-line-1">{{item.type_name}}</text>
				</view>
			</scroll-view>
			<block v-for="(item,index) in tabbar" :key="index">
				<scroll-view scroll-y class="right-box" v-if="current==index">
					<view class="page-view">
						<view class="class-item">
							<view class="item-title">
								<text>{{item.type_name}}</text>
							</view>



							<view class="item-container">



								<view class="wrap">
									<u-waterfall v-model="flowList" ref="uWaterfall">
										<template v-slot:left="{leftList}">
											<view class="demo-warter" v-for="(item, index) in leftlist" :key="index" @click="go(item)">
												<u-lazy-load threshold="<strong></strong>-450" border-radius="10"
													:image="item.image[0]" :index="index">
												</u-lazy-load>
												<view class="demo-title">
													{{item.title}}
												</view>
												<view class="demo-price">
													{{item.price}}元
												</view>
												<view class="demo-tag">
													<view class="demo-tag-owner">
														自营
													</view>
													<view class="demo-tag-text">
														放心购
													</view>
												</view>
											</view>
										</template>
										<template v-slot:right="{rightList}">
											<view class="demo-warter" v-for="(item, index) in rightlist" :key="index" @click="go(item)">
												<u-lazy-load threshold="-450" border-radius="10" :image="item.image[0]"
													:index="index">
												</u-lazy-load>
												<view class="demo-title">
													{{item.title}}
												</view>
												<view class="demo-price">
													{{item.price}}元
												</view>
												<view class="demo-tag">
													<view class="demo-tag-owner">
														自营
													</view>
													<view class="demo-tag-text">
														放心购
													</view>
												</view>
											</view>
										</template>
									</u-waterfall>
								</view>


							</view>
						</view>
					</view>
				</scroll-view>
			</block>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {

				title: "Hello",
				loadStatus: 'loadmore',
				flowList: [],
				leftlist: [],
				rightlist: [],

				tabbar: [],
				scrollTop: 0, //tab标题的滚动条位置
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度
			}
		},
		async onLoad() {
			const {
				data: res
			} = await this.$http('comtype', 'GET', this.vuex_token)
			console.log(res)
			this.tabbar = res.data
			this.food(res.data[0].id)
		},
		computed: {

		},
		methods: {
			search(){
				uni.navigateTo({
					url:"../Search/index"
				});
			},
			go(id){
				console.log(id)
				uni.navigateTo({
					url:`../submitBar/index?title=${id.title}&image=${id.image}&desc=${id.desc}&price=${id.price}&type_id=${id.type_id}&id=${id.id}`
				});
			},

			food(id) {
				this.$http('queryProductsByTypeId', 'GET', this.vuex_token, {
					type_id: id,
				}).then(res => {
					res.data.data.forEach(item => {
						console.log(item)
						item.image = item.image.split(',')
					})
					console.log(res.data.data)
					this.leftlist = []
					this.rightlist = []
					for (let i = 0; i < res.data.data.length; i++) {
						if (i % 2 != 0) {
							this.rightlist.push(res.data.data[i])
						} else {
							this.leftlist.push(res.data.data[i])
						}
					}
				})
			},


			getImg() {
				return Math.floor(Math.random() * 35);
			},
			// 点击左边的栏目切换
			async swichMenu(index, id) {
				this.leftlist = []
				this.rightlist = []
				this.food(id)
				if (index == this.current) return;
				this.current = index;
				// 如果为0，意味着尚未初始化
				if (this.menuHeight == 0 || this.menuItemHeight == 0) {
					await this.getElRect('menu-scroll-view', 'menuHeight');
					await this.getElRect('u-tab-item', 'menuItemHeight');
				}
				// 将菜单菜单活动item垂直居中
				this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
			},
			// 获取一个目标元素的高度
			getElRect(elClass, dataVal) {
				new Promise((resolve, reject) => {
					const query = uni.createSelectorQuery().in(this);
					query.select('.' + elClass).fields({
						size: true
					}, res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if (!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return;
						}
						this[dataVal] = res.height;
					}).exec();
				})
			}
		}
	}
</script>

<style lang="scss" scoped>
	.u-wrap {
		// height: calc(100vh);
		/* #ifdef H5 */
		// height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}

	.u-search-box {
		padding: 18rpx 30rpx;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
	}

	.u-search-inner {
		background-color: rgb(234, 234, 234);
		border-radius: 100rpx;
		display: flex;
		align-items: center;
		padding: 10rpx 16rpx;
	}

	.u-search-text {
		font-size: 26rpx;
		color: $u-tips-color;
		margin-left: 10rpx;
	}

	.u-tab-view {
		width: 200rpx;
		height: 100%;
	}

	.u-tab-item {
		height: 110rpx;
		background: #f6f6f6;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}

	.u-tab-item-active {
		position: relative;
		color: #000;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;
	}

	.u-tab-item-active::before {
		content: "";
		position: absolute;
		border-left: 4px solid $u-type-primary;
		height: 32rpx;
		left: 0;
		top: 39rpx;
	}

	.u-tab-view {
		height: 100%;
	}

	.right-box {
		background-color: rgb(250, 250, 250);
	}

	.page-view {
		padding: 16rpx;
		height: 100vh;
	}

	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx;
		border-radius: 8rpx;
		height: 100vh;
	}

	.item-title {
		font-size: 26rpx;
		color: $u-main-color;
		font-weight: bold;
	}

	.item-menu-name {
		font-weight: normal;
		font-size: 24rpx;
		color: $u-main-color;
	}

	.item-container {
		display: flex;
		flex-wrap: wrap;
	}

	.thumb-box {
		width: 33.333333%;
		display: flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		margin-top: 20rpx;
	}

	.u-column {
		flex: 0;
	}

	.item-menu-image {
		width: 120rpx;
		height: 120rpx;

	}




	.divder {
		margin-top: 100rpx;
	}

	.demo-warter {
		border-radius: 8px;
		margin: 5px;
		height: 300rpx;
		width: 252rpx;
		background-color: #ffffff;
		padding: 8px;
		position: relative;
	}

	.u-close {
		position: absolute;
		top: 32rpx;
		right: 32rpx;
	}

	.demo-image {
		width: 100%;
		border-radius: 4px;
	}

	.demo-title {
		font-size: 30rpx;
		margin-top: 5px;
		color: $u-main-color;
	}

	.demo-tag {
		display: flex;
		margin-top: 5px;
	}

	.demo-tag-owner {
		background-color: $u-type-error;
		color: #FFFFFF;
		display: flex;
		align-items: center;
		padding: 4rpx 14rpx;
		border-radius: 50rpx;
		font-size: 20rpx;
		line-height: 1;
	}

	.demo-tag-text {
		border: 1px solid $u-type-primary;
		color: $u-type-primary;
		margin-left: 10px;
		border-radius: 50rpx;
		line-height: 1;
		padding: 4rpx 14rpx;
		display: flex;
		align-items: center;
		border-radius: 50rpx;
		font-size: 20rpx;
	}

	.demo-price {
		font-size: 30rpx;
		color: $u-type-error;
		margin-top: 5px;
	}
</style>
